I have noticed that you have failed to acknowledge that women could be involuntarily committed by their husbands in the past for offenses as benign as talking back to or disobeying their husbands, refusing to do housework, or even just thinking for herself, wanting to make her own decisions. You have also failed to acknowledge the fact that women didn't have many choices in the past, even the recent past, particularly if they weren't married, especially if they were divorced, a fact that kept women in marriages that were bad. Heck, my grandparents didn't love each other, at least not most of their marriage. My entire childhood they had separate rooms, separate lives, went to separate churches, rarely rode in the same car together, never showed affection to one another. Yet they were married all that time. I was a child and noticed there was a problem there. My other grandparents who actually were divorced were more civil to each other, showed more affection toward each other than my married grandparents.
It is a good thing that termination of marriage is easier. It means that people can leave their situation and work to be happier. Does this sometimes work out bad for one of the two? Yes, but staying in an unloving marriage is most likely worse for that other person who feels the marriage is broken and can't get it fixed. Plus, the fact that divorce is easier also means that people have more incentive to actually work on their relationships if both of them want to really be in that relationship.